2000 dakota 3.9 auto 2 wd ext. cab. recently installed "new" rebuilt Jasper 3.9. the only thing used off of old motor was the intake and fuel injectors. everything else is new. the motor will stall to the point of knocking off at idle or at highway speeds. if it dows knock off it will start back up immediately with no problem. sometimes engine light will come on for a little while then goes back off. will give you a p0300, p0301, and p0305. before the swap motor ran perfect. the reason for the motor change, all the freeze plugs rusted out. truck wasn't drove much for last couple of years. any help would be appreciated. have question about ac also but that can wait.